GlobColour Overview

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• GlobColour Overview
• and achievements after two years

www.globcolour.info
Odile Fanton dAndon (ACRI-ST)
Diagram/illustration

• Session 2 GlobColour Progress
• 20 November 2007

www.globcolour.info
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• Outline of this presentation

• Background of GlobColour
• Phase 1 achievements
• Phase 2 achievements
• Provision of a long time-series (1997-2007) of
  consistently calibrated and merged global ocean
  colour products
• Validation and characterisation performed with
  available in situ observations
• Perspective Pre-operational ocean colour
  service element of the future EU GMES Marine Core
  Service

July 2002
October 2002
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Context
Background of GlobColour

• ESA DUE project i.e. driven by end users IOCCG,
  IOCCP, UK Met-Office,

Objectives

• Satisfy emerging demand for validated merged
  ocean colour derived information
• Demonstrate the current state of the art in
  merging together data streams from different
  ocean-colour sensors
• MERIS (ESA), SeaWiFS (NASA), MODIS-AQUA (NASA),
  (Polder-Parasol CNES)

• Provide a long time-series (10 years) of
  ocean-colour information

• Demonstrate a global NRT ocean-colour service
  based on merged satellite data
• Put in place the capacity to continue production
  of such time series inthe future and to prepare
  for full exploitation of Sentinel 3 (ESA)

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Background of GlobColour
CONSORTIUM ACRI-ST (France) Prime contractor
/ management Processor / Production

University of Plymouth (UK) User requirements
follow up/ design justification / merging
ARGANS LIMITED (UK) New products / Evolution
/merging NIVA (Norway) Validation (DDS)
Brockman Consult (Germany) Tools development Web
server ICESS (USA), DLR (Germany) LOV
(France) Scientific support
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Background of GlobColour
GlobColourDUE project 3 years - 3 phases
Phase 1 (2006) Demonstration of feasibility
Phase 2 (2007) Generation and validation of 10
year time series

• Today Second GlobColour User consultation at
  NIVA

Phase 3 (2008) Daily delivery of global merged
ocean colour products

• NRT demonstration
• Delivery to operational oceanography user
  community

Towards a sustainable European Ocean Colour
service part of the future EU GMES Marine Core
Service
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Users are always involved during the project for
consultation, advice andfinal assessment
Background of GlobColour
Users involvement
Generation and review of Requirements Baseline
Document, Design Justification File, and
Validation Protocol
KO2 Jan. 2006
Participation in the Critical Design Review
KO8 July 2006
User assessment of the Preliminary Product Sets
(radiance and biophysical) and selection of final
product
KO13 Dec. 2006
Participation in the end of phase 1 review
(advisors to ESA) and GlobColour User Workshop 1
(LOV)
User meeting at UK Met Office
KO16 Mar. 2007
User meeting at University of East Anglia
KO20 July 2007
User assessment of the Final Product Set (10
years)
KO23 Oct. 2007
Participation in the GlobColour User Workshop 2
(NIVA)
KO24 Nov. 2007
Participation in the GlobColour User Workshop 3
(ESRIN)
KO36 Nov. 2008
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Phase 1 (2006) Demonstration of feasibility

• Difficulties
• Sensors are not created equal different designs,
  calibrations, algorithms, accuracies,.
• Large volumes of data to deal with
• Merging procedure should not create biases,
  discontinuities, artifacts,

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Phase 1 (2006) Demonstration of feasibility

• Sensor characterisation (continued in Phase 2)

For validation / characterisation DDS
Diagnostic Data Set
Data Courtesy
SeaPRISM Giuseppe Zibordi, Brent Holben, Doug
Vandemark
see Samantha Lavenders presentation
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Phase 1 (2006) Demonstration of feasibility

• Sensor characterisation (continued in Phase 2)

Achievement Statistical uncertainties have been
derived and are used for merging
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Phase 1 (2006) Demonstration of feasibility
Developing the system

• Main modules
• Data acquisition
• Pre-processing
• Spatial binning
• Temporal binning
• Merging
• QC

• Globcolour processor

End 2006 System is ready for systematic
production
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WWW.globcolour.info The European Service for
Ocean Colour GlobColour is an ESA Data User
Element Project

• Data access
• Data products
• Methods
• Data tools
• Calendar
• About the Project
• Workshops and forum

GlobCOLOUR Project European Node for global Ocean
Colour
The GlobColour project is demonstrating an EO
based service supporting global ocean carbon
cycle research. Through this web portal, the
project provides scientists with a long time
series of consistently calibrated global ocean
colour information.
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Phase 1 (2006) Demonstration of feasibility
Merging recommendations Normalized
water-leaving radiances - Statistics are
slightly better when using the weighted average
than the simple average - Use of the weighted
average for the nLws Chlorophyll - GSM01
provides the best fit to in-situ chlorophyll - It
has the advantage of providing other products -
Pixel-by-pixel error bars can be provided in the
future - Produce also weighted average
Chlorophyll
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Presentation of the precursor service

• First users workshop at LOV, Villefranche, 4-6
  Dec. 2006

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Phase 2 (2007) Provision of a long time-series
(1997-2007)
see Gilbert Barrots presentation
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Phase 2 (2007) GlobColour products
(1997-2007)distributed to the users
Global ocean colour data set at 4.6 km resolution
covering 1997-2007 daily, weekly, monthly
products

• Chlorophyll concentration (Chla)
• Diffuse attenuation coefficient _at_ 490nm (Kd490)
• Total Suspended Matter
• CDM absorption (aCDM443)
• Particle backscattering coefficient (bbp443)
• Aerosol Optical Thickness (T865)
• Exact normalised water-leaving radiance _at_ 412,
  443, 490, 510, 531, 555, 620nm
• Water-leaving radiance _at_ 670, 681, 709nm
• Data quality flags
• Cloud fraction
• Excess of radiance at 555 nm (turbidity index)
  (EL555)
• Error estimates per pixel for each layer
• MODIS-only, MERIS-only

see Gilbert Barrots presentation
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Phase 2 (2007) Provision of a long time-series
(1997-2007)
Some numbers.. More than 25 Tb of input data
(level 2) 14 Tb of intermediate and output
products 4.5 Tb of distributed data netCDF,
JPG/PNG web, ftp, Google-Earth dedicated tools
are available (ISIN-PC grids)
All Google Earth tools are available (e.g. ruler,
places name)
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Phase 2 (2007) Validation

• Applying the Validation protocol defined in Phase
  1 ?
• Using
• punctual in situ measurements and ?
• time series obtained from long-term buoy
  measurements or from regular/ continuous cruises
  (e.g. ferrybox datasets) ?
• Validation of FPS merged products
• Focus on chlorophyll-a, diffuse attenuation
  coefficient, normalised water-leaving radiances
  (LwN). ?
• Perspectives on error uncertainties (See A.
  Mangin/S. Maritorena talks)

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Phase 2 (2007) Validation
Open ocean see David Antoine presentation
- Based on the match up with the global data set
of field data (Chl and nLws), the GlobColour FPS
is validated.
- The GlobColour FPS is definitely qualified and
usable for operational uses, such as assimilation
into global models (there is a pixel-by-pixel
error bar delivered with the GSM Chl), or
delivery of GMES services.
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Phase 2 (2007) Validation
Coastal waters see Dominique Durand presentation

• A better in-situ dataset for coastal case 2
  waters is needed (best results from Ferrybox data
  collection)!
• GSM01 merging algorithm seems quite robust over
  coastal waters
• GlobColour merged products show a potential for
  investigating seasonal to inter-annual
  variability in coastal zone should be
  investigated further !

NIVA-FerryBox CHL monthly mean
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Phase 2 (2007) Validation
Inter-comparison with other similar initiatives
(NASA, REASoN) see Stephane presentation
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GlobColour The global OC data service in the
European Marine Core Service Parallel
consistent with the Medspiration/GHRSST approach
Quality control and uncertainty estimation
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http//www.globcolour.info/
Thank you for your attention
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Monthly Chlorophyll May 2006
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